Exchange 2019 – Installation Fails at Mailbox Service

exchangeexchange-2016windows-server-2016windows-server-2019

I previously had Exchange 2010 (Windows Server 2008 R2 Standard) installed and two domain controllers 2008 and 2016. I have since removed the 2008 DC and 2010 Exchange Server and have a single 2016 controller.

I am currently in the process of installing Exchange 2019 (Microsoft Exchange Server 2019 Cumulative Update) on another box (Windows Server 2019) but the installation fails on step 8 of 12 (Mailbox role: Mailbox service).

I also get the below as part of the error message:

  • No RetentionPolicy assigned to E-Discovery arbitration mailbox currently, we need to set it here.

  • This can be remove after BUG(O15#2555914) is fixed.

I have a single Domain Controller (Windows Server 2016) and the Forest Functional Level set to Windows Server 2016

I am at a road block. Any suggestion to help me move forward?

Best Answer

In my research, it maybe related to the discovery system mailbox. Please check if it exists in "Users" OU.

If existing, please check the attribute “homeMDB” , ensure that it has a valid value same as other system mailbox.

Or run “Get-Mailbox -Filter { RecipientTypeDetails -eq "DiscoveryMailbox" } | fl name, database” to see if it returns any error.

If anything wrong, you could try to delete this system database, and recreate it by running "Setup.exe /IAcceptExchangeServerLicenseTerms /PrepareAD", then re-run the setup wizard and check if issue persists.

You could refer to this similar case.

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